9、—Is Tony good at _________?

—Yes，he is．I often hear him _________ in the neat room．

A．singing；sing                   B．sing；sing

C．singing；to sing                    D．to sing；singing

9、A

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—Is Tony good at _________?

—Yes，he is．I often hear him _________ in the neat room．

A．singing；sing                   B．sing；sing

C．singing；to sing                    D．to sing；singing

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